This is a note to let you know that I've just added the patch titled

iio: health: max30102: Add power enable parameter to get_temp function

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: iio-health-max30102-add-power-enable-parameter-to-get_temp-function.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Fri Mar 16 15:11:07 CET 2018

From: Peter Meerwald-Stadler pmeerw@pmeerw.net Date: Fri, 27 Oct 2017 21:45:38 +0200 Subject: iio: health: max30102: Add power enable parameter to get_temp function

From: Peter Meerwald-Stadler pmeerw@pmeerw.net

[ Upstream commit a9c47abbdd71dceeaf1b923e5ce10e700e036905 ]

Chip must not be in shutdown for reading temperature, so briefly leave shutdown if buffer is not already running

Signed-off-by: Peter Meerwald-Stadler pmeerw@pmeerw.net Acked-by: Matt Ranostay matt.ranostay@konsulko.com Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/health/max30102.c | 36 +++++++++++++++++++++++------------- 1 file changed, 23 insertions(+), 13 deletions(-)

--- a/drivers/iio/health/max30102.c +++ b/drivers/iio/health/max30102.c @@ -329,20 +329,31 @@ static int max30102_read_temp(struct max return 0; }

-static int max30102_get_temp(struct max30102_data *data, int *val) +static int max30102_get_temp(struct max30102_data *data, int *val, bool en) { int ret;

+ if (en) { + ret = max30102_set_powermode(data, true); + if (ret) + return ret; + } + /* start acquisition */ ret = regmap_update_bits(data->regmap, MAX30102_REG_TEMP_CONFIG, MAX30102_REG_TEMP_CONFIG_TEMP_EN, MAX30102_REG_TEMP_CONFIG_TEMP_EN); if (ret) - return ret; + goto out;

msleep(35); + ret = max30102_read_temp(data, val); + +out: + if (en) + max30102_set_powermode(data, false);

- return max30102_read_temp(data, val); + return ret; }

static int max30102_read_raw(struct iio_dev *indio_dev, @@ -355,20 +366,19 @@ static int max30102_read_raw(struct iio_ switch (mask) { case IIO_CHAN_INFO_RAW: /* - * Temperature reading can only be acquired while engine - * is running + * Temperature reading can only be acquired when not in + * shutdown; leave shutdown briefly when buffer not running */ mutex_lock(&indio_dev->mlock); - if (!iio_buffer_enabled(indio_dev)) - ret = -EBUSY; - else { - ret = max30102_get_temp(data, val); - if (!ret) - ret = IIO_VAL_INT; - } - + ret = max30102_get_temp(data, val, true); + else + ret = max30102_get_temp(data, val, false); mutex_unlock(&indio_dev->mlock); + if (ret) + return ret; + + ret = IIO_VAL_INT; break; case IIO_CHAN_INFO_SCALE: *val = 1000; /* 62.5 */

Patches currently in stable-queue which might be from pmeerw@pmeerw.net are

queue-4.15/iio-health-max30102-add-power-enable-parameter-to-get_temp-function.patch